security: add baseline security headers #692
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* Switch the global `.htaccess` header directives to `Header always set` so the security headers are emitted reliably for redirects and error responses as well * Use `Header always unset` in the `careers/.htaccess` to ensure the `X-Frame-Options` override continues to work when the global header is always set
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Summary
This PR adds a small set of conservative, low-risk HTTP security headers to the default Apache
.htaccessto improve baseline hardening for public OpenCATS installations.To avoid breaking setups where the Career Portal is embedded into an external website, the clickjacking protection (
X-Frame-Options: SAMEORIGIN) is applied globally but explicitly unset for/careers/(and all subpaths) via a dedicatedcareers/.htaccess.Motivation
OpenCATS currently ships without a baseline set of HTTP security headers. Adding these defaults provides immediate, broadly compatible security improvements for typical deployments without requiring server-specific configuration.
The chosen headers are intentionally conservative to minimize the risk of breaking existing installations or customizations, while still providing meaningful protection (e.g. against MIME sniffing, clickjacking, and unnecessary referrer leakage).